A Difcourfe proving from Experiments^ That the 
larger the V^fhtth of a Cozch^ifrc.are (cdeteri^ pa- 
ribus^) the more eafily they may be drawn over a 
Stone or fuch like objlack that lies inthewaj: by 
a Member of the Philofophical Society of Ox. 
ford. 
HAving read in the Mechanicks of Merfennus • , 
Hengoa*', and Dr, Wallis^ , 7hat the larger 
^eels of a Coach, &c. are,(cceteris paribus,) the morp 
eajiiy they may be drawn over a Jione or fuch lil(e objiacle 
that lies in their way; I was willing to try fo me Experi- 
ments which I thought might convince Ibme men bet- 
ter of the truth of it, then a Mathematicall demonftra- 
tion. ■ ■ ' 
I therefore ordered a Modell of a part of a Wagon to be 
made, confifting of 4 wheels, 2 axes and a board nailed 
upon the axes. The lefler wheels were 4| inches high; 
and the bigger wheels s\ inches high, z//^; L of the or- 
dinary height of the wheels of a Wagon : The weight of 
the Modell was almoft a pound and half. I had alfo 2 
other wheels made s\ inches high to be put oninftead 
of the lelTer. The middle of the 2 axes were djinches a- 
funder. All the wheels turned very eafily upon the axes. 
A piece of Lead ^-ol ^ avoirdupois was laid upon the , 
modell, fo forward that the leffer wheels feemedtobear 
above | parts of the weight. Then the modell was 
drawn with a firing laid over a Pulley, the top whereof 
was 5 ofan inch higher then the ^top of the hinder axis > 
» Geoni. pa. 455. b Mtc, pr. ic Schol. c Mec c. 7. pr. 3 Schol. § 15. 
and 
